In normal distributed file system, the concurrency of same file's copies was paid many attentions. Actually the relationship between different files also affects the operation to the other files, especially in a serialized file group occurred in Computer Supported Coordination Work system (CSCW). We defined 2 new locks and proposed an improved distributed lock algorithm to support file linking to achieve a higher efficiency. In addition, same file's multiple version was also supported. In the test, it confirmed the conclusion that the file linked distributed file system can improve the efficiency of CSCW.